The mean of $10, $15, $12, $20 and $x is $13. Calculate the value of x.
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What is the value of x? enter your answer in the box. (cm)

Adepartment store purchases screen-printed t-shirts at a cost of $5 per shirt. they mark up the price 150% (making the selling price 250% of the store's purchase price) and put them on the sales floor. every month that a t-shirt doesn't sell, the store reduces the selling price by 25%.

Which letters from the table represent like terms? a and b b and c a and d b and d